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Re: \transpose question


From: David Wright
Subject: Re: \transpose question
Date: Fri, 8 Oct 2021 10:45:53 -0500
User-agent: Mutt/1.10.1 (2018-07-13)

On Fri 08 Oct 2021 at 14:19:34 (+1100), Mark Probert wrote:
> David wrote:
> >> 
> >> Is there a way to do this?
> > 
> > Transpose the two halves of the melody separately,
> > the first half c to d, the second half cis to ees.
> > 
> This is part of the problem with the "pared down snippet" approach, or 
> rather, my original explanation of the problem. In reality, my problem 
> is more complicated. I am attempting to create a "practice book" for 
> various brass/woodwind instruments, so:
> 
>  + I have an exercise that goes through 12 keys: c-cis-d...bes-b
> 
>  + I want to use a single source for transposition to 3 keys: c, d, and 
> a (essentially concert, bes, and ees). The exercise are identical apart 
> from the key (the backing track is at a fixed pitch and I don't have 
> the ability to change it in any meaningful way).
> 
> Unfortunately, I suspect I am going to need to create a separate 
> edition for each transposition, but I hoped there would be a short cut.

What I was saying is that the you have the job impossible for
yourself. You've put two partial scales into your melody, the first in
three flats, and the second in four sharps. That means you took seven
steps clockwise you the circle of fifths: three flats out followed by
four sharps in, hard-coded into a single variable.

When you transpose that melody, your second half is always seven steps
clockwise. Whenever the rotation passes through the "great divide" at
e♭/d♯ (more familiarly G♭/F♯) you have to switch notation. But you
can't do that because you've written your melody as a single variable.
If you split it, you can choose the appropriate \transpose for each
half. I attach an exhaustive example, using full scales, showing all
the accidental and key signature versions. (The circle of fifths is
from #1040.)

Cheers,
David.

Attachment: transposing.ly
Description: Text document

Attachment: transposing.pdf
Description: Adobe PDF document

Attachment: snippet-circle-fifths.pdf
Description: Adobe PDF document


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